I'm thinking of upgrading to the Taboo amp. I own an se84c with the Radials 1.5. Total magic with my Siemens or Amperex Bugle Boy 6922's. The only downside of this setup is it just doesn't go loud enough for me sometimes without clipping. I'm ready for the Taboo, it sounds great. Especially the "lucid mode." But I need to know if I can use all these great, expensive, euro input tubes in the new Taboo, carried straight over from my se84c. I know the Taboo calls for a 12ax7 input tube, I just need to know if it can use the 6922's, and if so, what difference will be heard or not heard. Thanks everyone!!

My Bugle Boys are ecc83's, the euro equivalent of the u.s. 12ax7. So those are fine, will carry over to the Taboo. The Siemens are Cca's, 6922's, which are fantastic tubes, extremely detail oriented, but I guess they won't work for the Taboo.

You CANNOT use a 6922 type in a 12**7 circuit. The filament pinout is different, such that either the 6922 would be destroyed by having DOUBLE its proper filament voltage (12V series connection of 12**7 types) or else the 6922 would get no filament voltage at all and would not operate (6V parallel connection, which I assume is what the Taboo has.)

Oddly enough, you CAN put a 12AX7 in the 6922 slot of a Select, but then it runs at HALF its normal filament voltage, and sounds crappy. Not recommended.

Thanks guys, great info. Actually, I thought my Amperex Bugle Boys were ecc83's, but they are ecc88's, same as a 6922. So none of them will work in the new TABOO. But I will tell you this, they make a huge difference in my Zen amp, really magical. So the price and hype on these tubes really do play out on my ears. I'm wondering if the equivalent of a great Amperex input tube is the Telefunken ecc83's for pure magic. Or if a cryo'd Sovtek is 90% as good at 10% the price. Tell me what input tubes you love for the Taboo. Thanks again!